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CopyTo.cs
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CopyTo.cs
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namespace SuperLinq;
public static partial class SuperEnumerable
{
/// <summary>
/// Copies the contents of a sequence into a provided span.
/// </summary>
/// <typeparam name="TSource">
/// The type of elements of <paramref name="source"/>
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="span">
/// The span that is the destination of the elements copied from <paramref name="source"/>.
/// </param>
/// <returns>
/// The number of elements actually copied.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="span"/> is not long enough to hold the data from sequence.
/// </exception>
/// <remarks>
/// <para>
/// All data from <paramref name="source"/> will be copied to <paramref name="span"/> if possible.
/// </para>
/// <para>
/// If <paramref name="source"/> is shorter than <paramref name="span"/>, then any remaining elements will be
/// untouched. If <paramref name="source"/> is longer than <paramref name="span"/>, then an exception will be
/// thrown.
/// </para>
/// <para>
/// This operator executes immediately.
/// </para>
/// </remarks>
public static int CopyTo<TSource>(this IEnumerable<TSource> source, Span<TSource> span)
{
ArgumentNullException.ThrowIfNull(source);
if (source is TSource[] arr)
{
arr.AsSpan().CopyTo(span);
return arr.Length;
}
else if (source.TryGetCollectionCount() is int n)
{
if (n > span.Length)
ThrowHelper.ThrowArgumentException(nameof(span), "Destination is not long enough.");
var i = 0;
foreach (var el in source)
span[i++] = el;
return i;
}
else
{
var i = 0;
foreach (var el in source)
{
if (i >= span.Length)
ThrowHelper.ThrowArgumentException(nameof(span), "Destination is not long enough.");
span[i++] = el;
}
return i;
}
}
/// <summary>
/// Copies the contents of a sequence into a provided span.
/// </summary>
/// <typeparam name="TSource">
/// The type of elements of <paramref name="source"/>
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="array">
/// The span that is the destination of the elements copied from <paramref name="source"/>.
/// </param>
/// <returns>
/// The number of elements actually copied.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> or <paramref name="array"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="array"/> is not long enough to hold the data from sequence.
/// </exception>
/// <remarks>
/// <para>
/// All data from <paramref name="source"/> will be copied to <paramref name="array"/> if possible.
/// </para>
/// <para>
/// If <paramref name="source"/> is shorter than <paramref name="array"/>, then any remaining elements will be
/// untouched. If <paramref name="source"/> is longer than <paramref name="array"/>, then an exception will be
/// thrown.
/// </para>
/// <para>
/// This operator executes immediately.
/// </para>
/// </remarks>
public static int CopyTo<TSource>(this IEnumerable<TSource> source, TSource[] array)
{
ArgumentNullException.ThrowIfNull(source);
ArgumentNullException.ThrowIfNull(array);
return CopyTo(source, array, 0);
}
private static int CopyTo<TSource>(IEnumerable<TSource> source, TSource[] array, int index)
{
if (source is TSource[] arr)
{
arr.CopyTo(array, index);
return arr.Length;
}
else if (source is ICollection<TSource> coll)
{
coll.CopyTo(array, index);
return coll.Count;
}
else if (source.TryGetCollectionCount() is int n)
{
if (n + index > array.Length)
ThrowHelper.ThrowArgumentException(nameof(array), "Destination is not long enough.");
var i = index;
foreach (var el in source)
array[i++] = el;
return i - index;
}
else
{
var i = index;
foreach (var el in source)
{
if (i >= array.Length)
ThrowHelper.ThrowArgumentException(nameof(array), "Destination is not long enough.");
array[i++] = el;
}
return i - index;
}
}
/// <summary>
/// Copies the contents of a sequence into a provided list.
/// </summary>
/// <typeparam name="TSource">
/// The type of elements of <paramref name="source"/></typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="list">
/// The list that is the destination of the elements copied from <paramref name="source"/>.
/// </param>
/// <returns>
/// The number of elements actually copied.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> or <paramref name="list"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="NotSupportedException">
/// The <paramref name="list"/> is readonly, or does not allow increasing the size via <see
/// cref="ICollection{T}.Add(T)"/>
/// </exception>
/// <remarks>
/// <para>
/// All data from <paramref name="source"/> will be copied to <paramref name="list"/>, starting at position 0.
/// </para>
/// <para>
/// If <paramref name="source"/> is shorter than <paramref name="list"/>, then any remaining elements will be
/// untouched. If <paramref name="source"/> is longer than <paramref name="list"/>, then an exception may be
/// thrown if the <paramref name="list"/> has a fixed size (an <see cref="Array"/>, for example).
/// </para>
/// <para>
/// This operator executes immediately.
/// </para>
/// </remarks>
public static int CopyTo<TSource>(this IEnumerable<TSource> source, IList<TSource> list)
{
return source.CopyTo(list, 0);
}
/// <summary>
/// Copies the contents of a sequence into a provided list.
/// </summary>
/// <typeparam name="TSource">
/// The type of elements of <paramref name="source"/></typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="list">
/// The list that is the destination of the elements copied from <paramref name="source"/>.
/// </param>
/// <param name="index">
/// The position in <paramref name="list"/> at which to start copying data.
/// </param>
/// <returns>
/// The number of elements actually copied.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> or <paramref name="list"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="index"/> is less than <c>0</c>.
/// </exception>
/// <exception cref="NotSupportedException">
/// The <paramref name="list"/> is readonly, or does not allow increasing the size via <see
/// cref="ICollection{T}.Add(T)"/>
/// </exception>
/// <remarks>
/// <para>
/// All data from <paramref name="source"/> will be copied to <paramref name="list"/>, starting at position
/// <paramref name="index"/>.
/// </para>
/// <para>
/// If <paramref name="source"/> is shorter than <paramref name="list"/>, then any remaining elements will be
/// untouched. If <paramref name="source"/> is longer than <paramref name="list"/>, then an exception may be
/// thrown if the <paramref name="list"/> has a fixed size (an <see cref="Array"/>, for example).
/// </para>
/// <para>
/// This operator executes immediately.
/// </para>
/// </remarks>
public static int CopyTo<TSource>(this IEnumerable<TSource> source, IList<TSource> list, int index)
{
ArgumentNullException.ThrowIfNull(source);
ArgumentNullException.ThrowIfNull(list);
ArgumentOutOfRangeException.ThrowIfNegative(index);
if (list is TSource[] array)
{
return CopyTo(source, array, index);
}
else
{
#if NET6_0_OR_GREATER
if (list is List<TSource> l
&& source.TryGetCollectionCount() is int n)
{
l.EnsureCapacity(n + index);
}
#endif
var i = index;
foreach (var el in source)
{
if (i < list.Count)
list[i] = el;
else
list.Add(el);
i++;
}
return i - index;
}
}
}